According to Question; Efficiency of pipe ‘A’ = (180/12) = 15 litres/hour Efficiency of pipe ‘C’ = 15 ÷ 1.25 = 12 litres/hour Efficiency of pipe ‘B’ = 12 × 1.5 = 18 litres/hour Time taken by all the pipes together to fill the tank = {180/(15 + 12 + 18)} = (180/45) = 4 hours Or, time taken by all three pipes together to fill the tank = 4 × 45 = 180 minutes
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